Glassless mirrors use a flexible metalized polyester film . This is the same type of film you’ll find on the Hubble Space Telescope. The mirror is a flat piece of film mounted on a rigid foam core and featuring an aluminum frame to keep it sturdy. The end result is surprisingly lightweight. Where a wall-length mirror will take a whole team to safely lift and carry, a wall-length glassless mirror is light enough to be carried by a team of two or moved around by a single person on a portable mount.
Where a glass mirror is liable to shatter, which can lead to serious injury and leave tiny shards of glass in your dance floor for weeks, a glassless mirror is completely shatterproof. If you really try, you can break it, but you can’t shatter it. It won’t explode into a thousand tiny pieces if someone bumps into it a little too hard.
A glassless mirror is just as effective as a standard mirror, if not more so. Even when you take the shatterproof-ness and the lightweight out of the equation, many users actually prefer glassless on appearances alone, as you won’t get the phantom image that you get with a conventional glass mirror. This is because a glassless mirror is a flat surface, rather than a reflective film covered with a sheet of glass. Conventional mirrors always have that little double-image halo around the performer, where a glassless mirror is more like looking at a high-definition photograph. In dance glassless mirrors can be especially useful because you need absolute precision in your performance, and a glassless mirror will let you know if a single hair is out of place.
The portability of a glassless mirror is another big draw. You can mount your glassless mirror on the wall, the same as any other mirror, but by mounting it on a rolling frame, you can move it around the studio to wherever it needs to be. This can be helpful if you are renting your space and not allowed to make permanent changes, or if you already have wall-mounted mirrors but need to get a look at your moves from other angles.